module.exports = function (db, callback) {
    // 快递信息模型
    db.define("ExpressModel", {
        express_id: { type: 'serial', key: true },
        order_id: Number,
        express_com: String,
        express_nu: String,
        create_time: Number,
        update_time: Number
    }, {
        table: "sp_express"
    });
    return callback();
}